Submission #1084118

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084118		Boycl07	Furniture (JOI20_furniture)	C++17	100 / 100	187 ms	15956 KiB

furniture

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define rep(i, n) for(int i = 1; (i) <= (n); ++i)
#define forn(i, l, r) for(int i = (l); i <= (r); ++i)
#define ford(i, r, l) for(int i = (r); i >= (l); --i)
#define FOR(i, n) for(int i = 0; i < (n); ++i)
#define FORD(i, n) for(int i = ((n) - 1); i >= 0; --i)
#define fi first
#define se second
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define endl "\n"
#define task "BAI1"
#define sz(a) int(a.size())
#define C(x, y) make_pair(x, y)
#define all(a) (a).begin(), (a).end()
#define bit(i, mask) (mask >> i & 1)

template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }

inline int readInt()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();int n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline ll readLong()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();ll  n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline string readString() {char c;while(c=getchar(),c==' '||c=='\n'||c=='\t');string s({c});while(c=getchar(),c!=EOF&&c!=' '&&c!='\n'&&c!='\t')s+=c;return s;}

const int N = 1e3 + 3;
const int M = 1e3 + 3;
const int LOG = 50;
const int MOD = 1e9 + 7;
const ll INF = 1e18;

int n, m, q;

int c[N][N];

int cnt[2 * N];


void try_(int x, int y)
{
    if(!c[x][y])
    {
        --cnt[x + y];
        c[x][y] = 1;
        if(c[x + 1][y - 1])
        {
            if(!c[x + 1][y]) try_(x + 1, y);
            if(!c[x][y - 1]) try_(x, y - 1);
        }
        if(c[x - 1][y + 1])
        {
            if(!c[x][y + 1]) try_(x, y + 1);
            if(!c[x - 1][y]) try_(x - 1, y);
        }
    }
}

void solve()
{
    cin >> n >> m;
    forn(i, 0, n) c[i][0] = c[i][m + 1] = 1;
    forn(i, 0, m) c[0][i] = c[n + 1][i] = 1;
    rep(i, n) rep(j, m) ++cnt[i + j];
    rep(i, n) rep(j, m)
    {
        int x;
        cin >> x;
        if(x) try_(i, j);
    }
    cin >> q;
    rep(i, q)
    {
        int x, y;
        cin >> x >> y;
        if(c[x][y]) cout << 1 << endl;
        else
        {
            if(cnt[x + y] > 1) try_(x, y), cout << 1 << endl;
            else cout << 0 << endl;
        }
    }
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    int TC = 1;

    if(fopen("note.inp", "r"))
    {
        freopen("note.inp", "r", stdin);
        freopen("note.out", "w", stdout);
    }

    while(TC--)
    {
        solve();
        cout << endl;
    }

    return 0;
}

Compilation message (stderr)

furniture.cpp: In function 'int main()':
furniture.cpp:98:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |         freopen("note.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:99:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |         freopen("note.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95